Gas burner



Ap 5, 1938. l.. l.. scoTT 2,113,001

GAS BURNER Filed Nov. 18, 1935 2snee1s-shee1- 1 April 5, 1938. l L;SCOTT 2,113,001

GAS BURNER Filed Ndv. 1e, 1935 2 sheets-sneer 2 Patented Apr. 5, 1938UNITED STATES PATENT OFFICE 8 Claims.

This invention relates to gas burners of a type particularly adapted forhousehold heating, although its utility is not limited to that use. v

An object of the invention is to provide a gas 5 burner with meansl foropening and closing a gas supply line which is simple in construction,durable in service and economical in operation.

.Another object of the invention is to provide a gas burner with valvemechanism for opening and closing the supply line which will be soarranged that the use of packing about the valve is unnecessary. Morespecifically, an object is to provide a valve having a stem opening intoan air conduit or chamber in such a fashion that any small amount of gasleaking past the valve and past its stem, due to irregularities ofconstruction or wear, -will be discharged into the furnace where it maybe ignited by a pilot and thereby consumed.

Another object of the invention is to provide means simple inconstruction and durable in service to simultaneously close a gas Valve,and to close an air mixing valve, whereby air may be prevented fromentering the furnace when the burner is out of operation,

Another object of the invention is to utilize a motor which is providedfor furnishing a forced draft of air to the gas burner, also to open agas supply valve when the motor is placed in operation. In accordancewith the preceding objects vsuch a device may also be applied tosimultaneously open the air mixing valve if desired. Thus, a singleelectric circuit supplying the motor and controlled by a roomthermostat, for instance, may fully control the operation of the burner.4

Other objects will be apparent from the following descripton, taken inconnection with the accompanying drawings.

Fig. 1 is a vertical section showing an embodiment of my invention;

Fig. 2 is a bottom view;

Fig. 3 is a detail partly in section showing a clutch which is a part ofthe embodiment; and

Fig. 4 is acircuit diagram.

A furnace or boiler I to be heated, which may be of any selectedconstruction, has an opening 2 in which the burner may be installed. Theburner includes a shell or casing 3 having an annular chamber or conduit4 which communicates through an extended portion 5 and a port 6 withvalve housing l, connected to a gas supply line 8. The casing 3 has aninner annular Wall 9 forming a cylindrical chamber or conduit with aperforate bottom yWall I0, which supports a motor II, having a shaft I2extending through the Wall and driving an air propeller I3 positionedinside the cylindrical Wall or chamber 9.

The outer end of the motor shaft I2, through a chain of reducinggearing, drives a shaft I4 at a low` speed. An iron disc or armature I5is fixed to the shaft I4 and forms a part of a magnetic clutch foropening and closing a poppet valve I6 in the port 6, and for shifting aperforate damper plate II, which is so arranged with respect to theperforate plate I0 as to form an air mixing valve or damper for thechamber 9.

The valve I6 seats in the port 6 and its stem I8 extends through theannular wall 9 with its outer end exposed for engagement by a lever I9.The valve is closed and normally held in closed position by an expansionspring 20.

The lever I9 is connected by a link 2I to the damper plate II and isconnected by a link 22 to a clutch stator 23, pivotally mounted on theshaft I4 to cooperate with the clutch armature I5. The stator 23 isenergized by a coil 24 connected by Wires 25 to a supply circuit 26 forthe motor.

Hence, when the motor is not operating, the spring 20 Will close thefuel valve I6, thus moving the lever I9 to close the damper plate I'I.The air chambers will be closed at the bottom and any gas leakingthrough the valve and its stern Will flow into the furnace. When currentflows through the circuit 26, responsive for instance to the operationof a room thermostat 2l, the motor and its blower I3 will startoperation, and the coil 24 will cause engagement of the magnetic clutchto operate the lever I9 and thus open the damper plate Il and the valveI6.

The foregoing is a short description of the embodiment of the inventionspecifically shown in the drawings, while the essential features of theinvention are pointed out in the appended claims. The followingsupplemental description of the construction and operation of theembodiment specifically illustrated will assist in understanding andpracticing the invention.

The burner casing is provided with a burnerv opening comprising anannular slot 30 through the wall forming the annular chamber 4. Amushroom deflector 3| is spaced from the top Wall of the burner casingby means of legs 32. Thus, air passing through the chamber or conduit 9is deflected toward the burner opening 30. A pilot 33, as specificallyshown, is fed by gas from thechamber 1. The casing 3 is supported in theopening 2 and above a floor upon which the furnace may be placed by legs34.

The damper, as previously described, includes a fixed perforate plateI0, and a movable plate Il. The plate I0 is held in position by a numberof screws 35, each engaging in the casing and having a shoulder portionadjacent the head, the

shoulder engaging the plate I0 and holding it securely in position whilethe head is spaced` from the plate to provide a guide for the movableperforate plate Il. The motor II is supported by bolts 36 to the plateI0, while the plate II has appropriate arcuate slots to accommodate thesupports. The extent of opening of the damper plate I1 may be regulatedby an adjustable stop 31, having an abutment piece 38 for engagementwith a lug 39 secured to the plate 4l1. The stop 31 is held in positionby a screw 40 on the casing 3 and passing through a slot 4I in the stopmember 31. Thus, the stop member 31 may be held in a number of positionsdepending upon the setting of the screws 40 in the slot 4I.

The lever I9 includes an arm l2, which engages the end of the valve stemand an arm I3, to which is attached links 2| and 22, the arms beingadjustably positioned on a shaft M which is supported by a bracket 45attached to the casing 3. The levers are adjustable on the shaft M inorder to provide a proper valve clearance regardless of the adjustmentof the stop 31 for the damper.

The shaft Il, to which the clutch disc I5 is attached, is driven throughreducing gearing, not shown, by the motor shaft I2. The details of thegearing are not shown because it forms no part of the present inventionand its construction, which may be varied, is well understood in theart. It may be of the type commonly used for driving oscillatingmechanism in electric circulating fans, and rotates at substantially thesame speed, that is to say, between 4 and 5 R. P. M. If the burner is tobe used for heating, the motor circuit will ordinarily be controlled bya room' thermostat 21, shown diagrammatically in Fig. 4. That is to say,when the temperature of the room falls below the temperature for whichthe thermostat may be set, the motor circuit will be closed and themotorpnt inoperation. The operation of the motor rotates the shaft I4 andsince the coil 2l of the magnetic clutch is connected to the motorcircuit, mnvement of the disc I5 will tend to move the clutch element 23to rock the lever I9 and open the valve I8 and the damper plate I1.Rotation of the disc 23 `will continue until the damper plate I1 isopened and the lug 33 engages the abutment piece 33 on the stop member31. Thereafter, during operation of the motor the clutch will slip buthold the valve and damper open.

Upon a predetermined rise in temperature the thermostatic switch will beopened, thus stopping the motor and releasing the clutch element 23.Thereupon the `expansion spring 20 will press the valve I3 closed andmove the lever 42, thus closing the damper plate I1. Any gas which mightescape around the valve, due' to wear or faulty workmanship, and fromthe chamber 5 around the valve stem into the chamber I will be trappedby the shutter I1 and will now into the furnace under the mushroomdeilector 3| where it may be ignited by the pilot 33. Furthermore, draftwill be prevented from flowing through the air-duct 3 and thusunnecessarily cooling the furnace when the burner is oiI.-

From the foregoing it is obvious that the invention accomplishes itspurposes. i Parts of the invention may be used without -the whole andvarious changes may be made in the details of construction, vwithin thescope 4of the appended claims, without departing from the spirit of thisinvention.

I claim:

1. A gas burner having a supply port, a gas conduit leading from theport to a burner opening, an air conduit adjacent said gas conduitleading from atmosphere to said opening, a valve for opening and closingthe port and having a stem extending through a wall separating saidconduits, a damper for closing said air conduit, ar blower in the airconduit, a motor for driving the blower, mechanism for operating thestem and the damper, and a clutch for connecting the motor and themechanism arranged whereby the motor upon starting will operate themechanism and upon stopping will release the mechanism;

2.v In a gas burner, a blower, a motor for operating the blower, a gassupply valve, mechanismfor opening the valve, a magnetic clutch forconnecting when energized the motor and said mechanism, a-common circuitfor energizing both the motor and clutch, and resilient means forclosing the valve, whereby the valve will be opened and held open uponoperation of the blower and closed when current is cut on.' from themotor.

3. In a gas burner, a motor, a gas supply valve, yielding means fornormally holding the valve closed, mechanism for opening the valve, anda clutch device for connecting the motor and said mechanism arrangedwhereby the motor upon starting will operate the mechanism and uponstopping will release the mechanism.

4. In a gas burner,'a draft damper, a gas supply valve, a lever, anoperating connection between said lever and damper, an operatingconnection between the lever and the valve, arranged whereby the leverwill open the valve and damper, a blower, a motor for operating theblower, mechanism for operating the lever, and a 5. Apparatus foroperating aI supply valvel comprising, yielding means for closing thevalve, mechanism for opening the valve, an electric motor, a magneticclutch adapted when energized to connect the motor and said mechanism,and a common circuit to supplyl said motor and to actuate said clutch.

6. Apparatus for operating a supply valve comprising, yielding means forclosing the valve, mechanism for opening the valve, an electric motor, aslip clutch adapted to connect the motor and said mechanism, andarranged by slipping to permit continuous operation of the motor duringthe period said valve is open and to permit the yielding means to closesaid valve when the motor is stopped.

7. Apparatus for operating a supply valve ccmprising, an electric motor,reducing gearing operable bythe motor, mechanism for .opening the valve,a slip-clutch associated with` said gearing to actuate saidmechanism andadapted by slipping to permit continuous operation of the motor whilethe valve is open, and means independent of said gearing and motor.operable to close said valve when the motor is stopped.

8. Apparatus for operating a supply valve coni'- lprising, yieldingmeans for closing the valve,

mechanism-for opening the valve. an electric motor, reducing gearingoperable by the motor.

.a magnetic clutch adapted when energized to Said motor 8nd t0 actuateSaid clutch.

LEWIS L. SCOI'I.

